The principal walked onto the platform and seated himself in a chair, for answering questions.
A. prepared
B. being prepared
C. prepared
D. preparing
网友回答
A. prepared
B. being prepared
(答案→)C. prepared
D. preparing
解析：此处prepared相当于形容词，意为：准备好了的。这里形容词短语作伴随状语。故选C。句意：校长走上讲台，坐下，准备回答问题。